Drilling mechanism



Jan. 2, 1934. f R, H, WlLHELM 1,942,014

DRILLING MECHANISM Filed July 20, 1933 HLSA TTORNEY.

Patented Jan. 2, 1934 UNITED STATES DRILLING Russell H; Wilhelm, Ea

MECHANISM ston, Pa., assignor to Ingersoll-Rand Company, Jersey City, N.J., a

corporation of New J el'Sey Application July 20, 1933. Serial No.681,232

3 Claims.

This invention relates to drilling mechanism, and more particularly todrilling mechanism equipped with means for preventing rebound of therock drill with respect to its support in order that the rock drill maybe either advanced toward the work or retracted therefrom by the jarresulting upon reversal of its piston.

One object of the invention is to enable the drilling motor tobeadvanced and retracted upon the support with a single manual setting ofthe recoil arresting device.

Other objects will be in part obvious and in part pointed outhereinafter.

In the drawing accompanying this specification and in which similarreference numerals refer to similar parts,

Figure 1 is a longitudinal side elevation of a drilling mechanismconstructed in accordance with the practice of the invention and showingthe recoil arresting device in one limiting position,

Figure 2 is a similar view showing the recoil arresting device inanother limiting position, and

Figure 3 is a perspective view illustrating more particularly the mannerin which the recoil arresting device is held in one of its limitingpositions. f

Referring more particularly to the drawing, 4 designates a rock drillequipped with a carriage 5 mounted slidably upon a support 6.

The support 6 may, as indicated, be of structural shape, as for instancean -beam, and in the opposite sides of the carriage 5 are guideways 7,only one of which is shown in Figure 3, to receive the flange 8 of thesupport 6 and whereon the carriage 5 slides. The rock drill 4, which maybe of any well known type, has the usual front and back heads 9 and 10which may be secured to a cylinder 11 by side rods 12, in the usualmanner.

The front head 9 acts as a guide for a working implement 13, such as adrill steel, and within the cylinder 11 is a reciprocatory hammer piston14 to strike against the working implement 13 for driving it into theWork.

The pressure fluid utilized for actuating the piston 14 may bedistributed to the ends of the cylinder 1l by any suitable form ofdistributing valve (not shown) and communication between 50V thedistributing valve and the source of pressure fluid supply may becontrolled by a throttle valve only the lever l5 of which is shown.

In accordance with a well known practice the drilling motor 4, or moreparticularly the carriage 5 carrying the motor, is provided with means(Cl. Z55-45) adapted to alternately seize and release the flange 8 ofthe support 6 to enable the rock drill to be actuated longitudinally ofthe support 6. The means illustrated for this purpose comprises a link16 having a gripping portion 1'7 adapted to grip the flange 8 and a stem13 of which the free end extends into an aperture 19 in a bracket 2Oconstituting the rear end of the carriage 5. The aperture 19 ispreferably of somewhat larger dimensions than the portion of the stem 16lying therein so that the link 16 may be readily tilted to its Variousgripping positions.

The means provided for positioning the link 16 comprises a shaft 21journalled in the bracket 2O and having a crank pin 22 which pivotallyengages the end of a rod 23 extending through the link 16 and having anut 24 threaded on its free end. Disposed on the rod 23 and on oppositesides of the link 16 against which they seat are springs 25 and 26 tohold the link 16 yieldably in position for gripping the flange 8. Theshaft 21 may, as shown, be provided with a suitable grip element 2'7 forrotating the shaft and consequently to actuate the link 16 toitslimiting positions.

In accordance with the practice of the invention means are provided forholding the link 16 positively in gripping relation with respect to theflange 8 to assure continuous movement of the rock drill 4 in thedirection of the Work and also to automatically eect reversal of thelink when the rock drill 4 reaches a position wherein the workingimplement 13 has penetrated the work to the limit of its extent. Tothese ends the carriage 5 is provided with a latch 28 adapted to engagea detent 29 in the outer end of the shaft 21. The latch 28 is pivotedupon a pin 30 carried by the carriage 5 and has a depending arm 31which, when the carriage 5 moves forwardly, engages an abutment 32 nearthe front end of the support 6 for tripping the latch to disengage thedetent 29.

The outer end of the shaft 21 is preferably in the form of a drum 33 forthe accommodation of a flexible element, such as a chain 34, which isconnected with one end to the drum by a screw 35. The other end of thechain 34 engages an end of a tension spring 36 which extends forwardlyalong the rock drill 4 and is hooked to a washer 37 arranged on a bolt38 extending through a boss 39 of the carriage 5 and which bolt mayserve to clamp the rock drill to the carriage.

On or near the rear end of the support 6 is an arm 40 which extends withits free end 41 into the path of the throttle lever` 15 so that when thedrill reaches the rear end of the mounting the said lever 15 will abutthe arm 40 and, as the rock drill continues in a rearwardly' direction,the throttle Valve which the lever 15 controls Will be closed to cut offthe ow of pressure fluid to the rock drill.

The operation of the device is as follows: Let it be assumed that therock drill 4 occupies its rearmost limiting position on the support 6and that it be desired to cause it to be actuated forwardly along thesupport in the direction of the work. The shaft 21 may then be rotatedto the left hand position as Figure 1 is viewed. Thus positioned thelatch 28 engages the detent 29 and the spring 26 will be compressed sothat it will maintain the link 16 constantly in position to grip theange 8. During the subsequent operation of the rock drill 4 the jarresulting upon reversal of the piston 14 in the front end of thecylinder l1 is imparted to the rock drill, thereby causing the rockdrill, together with the carriage 5, to be shifted forwardly. Uponreversal of the piston 14 in the rear end of the cylinder the shock ofreversal will cause the gripping portion 1'7 to seize the flange 8 andprevent recoil of the rock drill.

As the rock drill proceeds forwardly and about the time the Workingimplement 13 has penetrated the rock to the limit of its extent the arm31 of the latch 28 engages the abutment 32 which trips the latch 28 torelease the detent 29. The spring 36 which, during the forward movementof the drill, is tensioned will then contract and, by rotating the shaft21, shift the link 16 rearwardly to its other limiting position, Thisaction of the spring 36 will also place the spring 25 on the rod 23under compression so that the gripping portion will be held constantlyin position for engaging the flange 8 of the support 6.

With the parts in the new positions described and with the rock drill 4continuing its operation the rock drill and the carriage will be movedrearwardly by the jars imparted thereto by the piston 14 upon reversalthereof in the rear end of the cylinder. Upon reversal of the piston inthe front end of the cylinder the link 16 will, by its grippingengagement upon the flange 8, maintain the rock drill immovable withrespect to the support 6. The rock drill and the carriage will,therefore, be retracted toward the rear end of the support 6 and uponcontact of the throttle lever 15 with the end 41 of the arm 40 thethrottle valve Will be rotated to its closed position and in that Waycut off the supply of pressure iuid to the rock drill.

In practice the present invention has been found to operate withcertainty and with a minimum of attention on the part of the operatorsince, as Will be readily understood, it is merely necessary to set therecoil arresting device in position for advancing the drill toward theWork. Simultaneously with the setting of the parts to bring about thisresult the spring 36 is tensioned so that, upon release of the latch 28from the detent 29, it may act to reverse the recoil arresting device.It Will be obvious, therefore, that after the drill has been set inoperation it will proceed both towards the Work and return to itsinitial starting position without further attention on the part of theoperator.

I claim:

l. In a drilling mechanism, the combination of a support and apercussive motor thereon subjected to jars incident to its operationtending to move the motor along the support, recoil arresting means forthe motor, latch means for locking the recoil arresting means in onelimiting position, means for tripping the latch means to disengage therecoil arresting means, and means carried by the percussive motor actingto reverse the recoil arresting means upon disengagement of the latchmeans from the recoil arresting means.

2. In a drilling mechanism, the combination of a support and apercussive motor thereon subjected to jars incident to its operationtending to move the motor along the support, recoil arresting means forthe motor, a shiftingr device for the recoil arresting means, latchmeans to engage the shifting device for holding the recoil arrestingmeans in one limiting position, and means acting to move the shiftingdevice for shifting the recoil arresting means to another limitingposition upon disengagement of the latch means from the shifting device.

3. In a drilling mechanism, the combination of a support and a percussvemotor thereon subjected to jars incident to its operation tending tomove the motor along the support, means carried by the motor and beingadapted to engage the support to prevent rebound of the motor, ashifting device for actuating the said means to limiting positions, aspring connected to the shifting device and the motor, a latch to engagethe shifting device for holding the said means in one limiting positionand to maintain the spring under tension, and an abutment on the supportto trip the latch out of engagement with the shifting device, therebyenabling the spring to actuate the shifting device and thus move thesaid means to another limiting position.

RUSSELL H. WILHELM.

